<!DOCTYPE html>
<html>
    <head>
        <script src="vue.js"></script>
      <style>
          .box{
              background-color: pink;
              width: 100%;
              height: 200px;
          }

          .inner{
              background-color: red;
              width: 100px;
              height: 50px;
              border: 2px solid white;
          }
      </style>
    </head>
    <body>
        <div id="app">
            <div v-bind:class="box1">
                我是box
                <div v-bind:class="[inner1,border]">我是inner1</div>
                <div v-bind:class="inner1">我是inner2</div>
            </div>
        </div>
        <script>
            var vm = new Vue({
                el:'#app',
                data:{
                    box1:'box',
                    inner1:'inner',
                    border:'border'
                }
            });
        </script>
    </body>
</html>